feat: add printcolumn to RAG Engine

[bangqipropel]

Reason for Change:
add printcolumn to RAG Engine

Requirements

• added unit tests and e2e tests (if applicable).

Issue Fixed:

Notes for Reviewers:

[codecov]

Codecov Report

Attention: Patch coverage is 42.11765% with 246 lines in your changes missing coverage. Please review.

Project coverage is 53.40%. Comparing base (5c30038) to head (9436826).
Report is 24 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/controllers/ragengine_controller.go	27.94%	152 Missing and 13 partials ⚠️
pkg/nodeclaim/nodeclaim.go	63.49%	23 Missing ⚠️
pkg/machine/machine.go	64.00%	18 Missing ⚠️
api/v1alpha1/ragenging_validation.go	0.00%	14 Missing ⚠️
pkg/webhooks/webhooks.go	0.00%	14 Missing ⚠️
pkg/controllers/workspace_controller.go	43.75%	9 Missing ⚠️
pkg/controllers/ragengine_status.go	94.73%	1 Missing and 1 partial ⚠️
api/v1alpha1/ragengine_default.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #623      +/-   ##
==========================================
- Coverage   58.18%   53.40%   -4.79%     
==========================================
  Files          30       34       +4     
  Lines        2987     3500     +513     
==========================================
+ Hits         1738     1869     +131     
- Misses       1149     1516     +367     
- Partials      100      115      +15     

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